RE: Standby Database performance
- From: "Chitale, Hemant Krishnarao" <Hemant.Chitale@xxxxxx>
- To: <kapilvaish1@xxxxxxxxx>
- Date: Thu, 24 Nov 2011 09:51:36 +0800
Have you tried actually *reducing* the degree of parallelism ?
A high degree of parallelism causes the PQ slaves to interfere with each other
in a Recovery scenario.
This particularly happens with large transactions that update many indexes and
then issue ROLLBACKs.
See Oracle Support article
How to Disable Parallel Transaction Recovery When Parallel Txn Recovery is
Active --- 238507.1
Parallel Rollback may hang database, Parallel query servers get 100% cpu ---
144332.1
Hemant K Chitale
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of kapil vaish
Sent: Wednesday, November 23, 2011 3:24 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Standby Database performance
Hi Guys ,
we have physical standby database for one of our biggest database. Scripts ship
the archived log to standby server and then using parallel 32, manual recovery
is performed (thru scripts) . Archived log size is 2 GB and daily production
archive generation is aorund 2.5 TB. We are trying to increase performance on
our standby database. We tried tuning various standby related parameters and
IO, maximum apply rate we could achieve is 45 sec per archive log. Can you
suggest any other tunings you may have seen in your environments ? any pointers
are appreciated ..
thanks
kapil Vaish
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